18 April 2006, 04:00
henqui, a B21FT water-cooled turbo should work fine on your B21ET.
Actually, Volvo never installed water-cooled Garrett turbos on the B21ETs or B21FTs. They did start using water-cooled Garretts in 1987 on the 740Ts. And people started using that particular turbo to upgrade the 240Ts to water-cooled turbos.
Volvo came out with a P/N for a replacement turbo for the 240Ts that had the water-cooled center section. There was a reason for them to do that. The Garretts that they used on the 740Ts used a .48 A/R turbine housing. And all the Garretts that Volvo used on the 240Ts used a .63 A/R turbine housing.
Some people prefer the .48 turbine housing: it spools up faster than the turbos using the .63 turbine housing. While that is true, there is a downside to that: the .48 housing tends to restrict the flow at higher RPMs than does the .63 housing.
On my B21FTi, I have the Garrett water-cooled T3 that has a .63 turbine housing. With a ported 90+ manifold and 3in exhaust, I do not have any problem with spooling. I had a T3 with the .48 housing. I could feel the restriction at higher RPMs [at least, it felt like that to me].
According to Mahle, the B21ETs and the B21FTs both use the same piston: Mahle P/N 037 23 00 [STD]. And both motors are listed as having 7.5:1 SCR. As I understand it, the differences between them that allows for the B21ETs to be rated at a higher horsepower level is because the B21FTs have a catalytic converter; and the B21FTs [USA] were equipped with the T camshaft. The B21ETs did not have a catalytic converter; and were equipped with different camshafts; possibly an A cam or a B cam.
But, I have heard that the B21ETs had a higher SCR. I do not remember seeing any Volvo information that says that. If someone has Volvo information that lists different pistons or a higher SCR for the B21ETs, I would certainly like to read it. All my info here in the USA is just about the B21FTs. It is like we are not allowed to know about the B21ETs.
TF
Actually, Volvo never installed water-cooled Garrett turbos on the B21ETs or B21FTs. They did start using water-cooled Garretts in 1987 on the 740Ts. And people started using that particular turbo to upgrade the 240Ts to water-cooled turbos.
Volvo came out with a P/N for a replacement turbo for the 240Ts that had the water-cooled center section. There was a reason for them to do that. The Garretts that they used on the 740Ts used a .48 A/R turbine housing. And all the Garretts that Volvo used on the 240Ts used a .63 A/R turbine housing.
Some people prefer the .48 turbine housing: it spools up faster than the turbos using the .63 turbine housing. While that is true, there is a downside to that: the .48 housing tends to restrict the flow at higher RPMs than does the .63 housing.
On my B21FTi, I have the Garrett water-cooled T3 that has a .63 turbine housing. With a ported 90+ manifold and 3in exhaust, I do not have any problem with spooling. I had a T3 with the .48 housing. I could feel the restriction at higher RPMs [at least, it felt like that to me].
According to Mahle, the B21ETs and the B21FTs both use the same piston: Mahle P/N 037 23 00 [STD]. And both motors are listed as having 7.5:1 SCR. As I understand it, the differences between them that allows for the B21ETs to be rated at a higher horsepower level is because the B21FTs have a catalytic converter; and the B21FTs [USA] were equipped with the T camshaft. The B21ETs did not have a catalytic converter; and were equipped with different camshafts; possibly an A cam or a B cam.
But, I have heard that the B21ETs had a higher SCR. I do not remember seeing any Volvo information that says that. If someone has Volvo information that lists different pistons or a higher SCR for the B21ETs, I would certainly like to read it. All my info here in the USA is just about the B21FTs. It is like we are not allowed to know about the B21ETs.
TF